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Title: Surface modified stainless steels for PEM fuel cell bipolar plates

Abstract

A nitridation treated stainless steel article (such as a bipolar plate for a proton exchange membrane fuel cell) having lower interfacial contact electrical resistance and better corrosion resistance than an untreated stainless steel article is disclosed. The treated stainless steel article has a surface layer including nitrogen-modified chromium-base oxide and precipitates of chromium nitride formed during nitridation wherein oxygen is present in the surface layer at a greater concentration than nitrogen. The surface layer may further include precipitates of titanium nitride and/or aluminum oxide. The surface layer in the treated article is chemically heterogeneous surface rather than a uniform or semi-uniform surface layer exclusively rich in chromium, titanium or aluminum. The precipitates of titanium nitride and/or aluminum oxide are formed by the nitriding treatment wherein titanium and/or aluminum in the stainless steel are segregated to the surface layer in forms that exhibit a low contact resistance and good corrosion resistance.

Inventors:
 [1];  [2];  [2]
  1. Oak Ridge, TN
  2. Littleton, CO
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
913099
Patent Number(s):
7,247,403
Application Number:
11/071,830
Assignee:
UT-Battelle, LLC (Oak Ridge, TN)
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Brady, Michael P, Wang, Heli, and Turner, John A. Surface modified stainless steels for PEM fuel cell bipolar plates. United States: N. p., 2007. Web.
Brady, Michael P, Wang, Heli, & Turner, John A. Surface modified stainless steels for PEM fuel cell bipolar plates. United States.
Brady, Michael P, Wang, Heli, and Turner, John A. 2007. "Surface modified stainless steels for PEM fuel cell bipolar plates". United States. https://www.osti.gov/servlets/purl/913099.
@article{osti_913099,
title = {Surface modified stainless steels for PEM fuel cell bipolar plates},
author = {Brady, Michael P and Wang, Heli and Turner, John A},
abstractNote = {A nitridation treated stainless steel article (such as a bipolar plate for a proton exchange membrane fuel cell) having lower interfacial contact electrical resistance and better corrosion resistance than an untreated stainless steel article is disclosed. The treated stainless steel article has a surface layer including nitrogen-modified chromium-base oxide and precipitates of chromium nitride formed during nitridation wherein oxygen is present in the surface layer at a greater concentration than nitrogen. The surface layer may further include precipitates of titanium nitride and/or aluminum oxide. The surface layer in the treated article is chemically heterogeneous surface rather than a uniform or semi-uniform surface layer exclusively rich in chromium, titanium or aluminum. The precipitates of titanium nitride and/or aluminum oxide are formed by the nitriding treatment wherein titanium and/or aluminum in the stainless steel are segregated to the surface layer in forms that exhibit a low contact resistance and good corrosion resistance.},
doi = {},
url = {https://www.osti.gov/biblio/913099}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2007},
month = {7}
}